//图片存储地址 图片上传预览

function previewImage(file) {
    //设置大小
    var MAXWIDTH = 70;
    var MAXHEIGHT = 70;
    var div = document.getElementById('preview');
    var im = document.getElementById('imgUrl');

    if (file.files && file.files[0]) {
        div.innerHTML = '<img id=imghead>';
        var img = document.getElementById('imghead');
        img.onload = function () {
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            img.width = rect.width;
            img.height = rect.height;
            img.style.marginTop = rect.top + 'px';
        }
        var reader = new FileReader();
        reader.onload = function (evt) {
            img.src = evt.target.result;
        }
        reader.readAsDataURL(file.files[0]);
    }
    else //兼容IE
    {
        var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
        file.select();
        var src = document.selection.createRange().text;
        div.innerHTML = '<img id=imghead>';
        var img = document.getElementById('imghead');
        img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
        status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);
        div.innerHTML = "<div id=divhead2 style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";
    }
}
function clacImgZoomParam(maxWidth, maxHeight, width, height) {
    var param = {top: 0, left: 0, width: width, height: height};
    if (width > maxWidth || height > maxHeight) {
        rateWidth = width / maxWidth;
        rateHeight = height / maxHeight;

        if (rateWidth > rateHeight) {
            param.width = maxWidth;
            param.height = Math.round(height / rateWidth);
        } else {
            param.width = Math.round(width / rateHeight);
            param.height = maxHeight;
        }
    }

    param.left = Math.round((maxWidth - param.width) / 2);
    param.top = Math.round((maxHeight - param.height) / 2);
    return param;

}

//商品列表图片url 图片上传预览
function previewImage1(file) {
    var MAXWIDTH = 150;
    var MAXHEIGHT = 100;
    var div = document.getElementById('preview1');
    var im = document.getElementById('commodityImgUrl');

    if (file.files && file.files[0]) {
        div.innerHTML = '<img id=imghead1>';
        var img = document.getElementById('imghead1');
        img.onload = function () {
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            img.width = rect.width;
            img.height = rect.height;
            img.style.marginTop = rect.top + 'px';
        };
        var reader = new FileReader();
        reader.onload = function (evt) {
            img.src = evt.target.result;
        };
        reader.readAsDataURL(file.files[0]);
    }
    else //兼容IE
    {
        var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
        file.select();
        var src = document.selection.createRange().text;
        div.innerHTML = '<img id=imghead1>';
        var img = document.getElementById('imghead1');
        img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
        status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);
        div.innerHTML = "<div id=divhead2 style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";
    }
}
function clacImgZoomParam(maxWidth, maxHeight, width, height) {
    var param = {top: 0, left: 0, width: width, height: height};
    if (width > maxWidth || height > maxHeight) {
        rateWidth = width / maxWidth;
        rateHeight = height / maxHeight;

        if (rateWidth > rateHeight) {
            param.width = maxWidth;
            param.height = Math.round(height / rateWidth);
        } else {
            param.width = Math.round(width / rateHeight);
            param.height = maxHeight;
        }
    }

    param.left = Math.round((maxWidth - param.width) / 2);
    param.top = Math.round((maxHeight - param.height) / 2);
    return param;

}
//明细title图片路径 图片上传预览
function previewImage2(file) {
    var MAXWIDTH = 150;
    var MAXHEIGHT = 100;
    var div = document.getElementById('preview2');
    var im = document.getElementById('titleUrl').value;
    // alert(im)
    if (file.files && file.files[0]) {
        div.innerHTML = '<img id=imghead2>';
        var img = document.getElementById('imghead2');
        img.onload = function () {
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            img.width = rect.width;
            img.height = rect.height;
            img.style.marginTop = rect.top + 'px';
        }
        var reader = new FileReader();
        reader.onload = function (evt) {
            img.src = evt.target.result;
        }
        reader.readAsDataURL(file.files[0]);
    }
    else //兼容IE
    {
        var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
        file.select();
        var src = document.selection.createRange().text;
        div.innerHTML = '<img id=imghead2>';
        var img = document.getElementById('imghead2');
        img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
        status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);
        div.innerHTML = "<div id=divhead2 style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";
    }
}
function clacImgZoomParam(maxWidth, maxHeight, width, height) {
    var param = {top: 0, left: 0, width: width, height: height};
    if (width > maxWidth || height > maxHeight) {
        rateWidth = width / maxWidth;
        rateHeight = height / maxHeight;

        if (rateWidth > rateHeight) {
            param.width = maxWidth;
            param.height = Math.round(height / rateWidth);
        } else {
            param.width = Math.round(width / rateHeight);
            param.height = maxHeight;
        }
    }

    param.left = Math.round((maxWidth - param.width) / 2);
    param.top = Math.round((maxHeight - param.height) / 2);
    return param;

}
//明细title图片路径 图片上传预览
function previewImageSmall(file) {
    var MAXWIDTH = 100;
    var MAXHEIGHT = 80;
    var div = document.getElementById('previewSmall');
    var im = document.getElementById('smallUrl').value;
    //alert(im)
    if (file.files && file.files[0]) {
        div.innerHTML = '<img id=imgheadSmall>';
        var img = document.getElementById('imgheadSmall');
        img.onload = function () {
            var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
            img.width = rect.width;
            img.height = rect.height;
            img.style.marginTop = rect.top + 'px';
        }
        var reader = new FileReader();
        reader.onload = function (evt) {
            img.src = evt.target.result;
        }
        reader.readAsDataURL(file.files[0]);
    }
    else //兼容IE
    {
        var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
        file.select();
        var src = document.selection.createRange().text;
        div.innerHTML = '<img id=imgheadSmall>';
        var img = document.getElementById('imgheadSmall');
        img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
        status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);
        div.innerHTML = "<div id=divheadSmall style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";
    }
}
function clacImgZoomParam(maxWidth, maxHeight, width, height) {
    var param = {top: 0, left: 0, width: width, height: height};
    if (width > maxWidth || height > maxHeight) {
        rateWidth = width / maxWidth;
        rateHeight = height / maxHeight;

        if (rateWidth > rateHeight) {
            param.width = maxWidth;
            param.height = Math.round(height / rateWidth);
        } else {
            param.width = Math.round(width / rateHeight);
            param.height = maxHeight;
        }
    }

    param.left = Math.round((maxWidth - param.width) / 2);
    param.top = Math.round((maxHeight - param.height) / 2);
    return param;

}

